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Summary of Budgeted Construction Expenditures (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Summary of Budgeted Construction Expenditures [Line Items]
2015	$ 569.2
2016	514.4
2017	443.5
2018	300.2
2019	380.0
Total	2,207.3
Public Service Company of New Mexico [Member]
Summary of Budgeted Construction Expenditures [Line Items]
2015	423.9
2016	402.3
2017	334.8
2018	180.6
2019	260.3
Total	1,601.9
Texas-New Mexico Power Company [Member]
Summary of Budgeted Construction Expenditures [Line Items]
2015	121.3
2016	92.8
2017	93.3
2018	105.9
2019	105.0
Total	518.3
Other Subsidiaries [Member]
Summary of Budgeted Construction Expenditures [Line Items]
2015	24.0
2016	19.3
2017	15.4
2018	13.7
2019	14.7
Total	87.1
San Juan Generating Station [Member] \| Public Service Company of New Mexico [Member]
Summary of Budgeted Construction Expenditures [Line Items]
Environmental Upgrades Requirement Estimates	70.7
Budgeted Construction Expenditures Related to Replacement Capacity	268.4
Four Corners Units 4 and 5 (Coal) [Member] \| Public Service Company of New Mexico [Member]
Summary of Budgeted Construction Expenditures [Line Items]
Environmental Upgrades Requirement Estimates	$ 80.0